Skip to content
WanderNerd
Check a flight

Flight Reliability

AS 656 · Alaska Airlines

San Francisco → Seattle (SFO–SEA)

63
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
15 min
Average arrival delay
2.6%
Cancelled
1 min early
Median arrival delay

Based on 154 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

AS 656 departing between 6–9 AM arrived on time 83% of the time, versus 64% between 9 AM–12 PM.

Sunday scaries are real for this one.

AS 656 arrived on time 85% of the time on Tuesdays and just 59% on Sundays. That gap is worth planning around.

Lagging the SFO–SEA route.

AS 656 arrived on time 68% of the time, versus 75% across the SFO–SEA route.

Lagging the Alaska Airlines network.

AS 656 arrived on time 68% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon64%(25 flights)
  • Tue85%(26 flights)
  • Wed65%(26 flights)
  • Thu71%(24 flights)
  • Fri60%(25 flights)
  • Sat—(2 flights)
  • Sun59%(22 flights)
On-time by departure window
  • 6–9 AM83%(30 flights)
  • 9 AM–12 PM64%(120 flights)
On-time trend by month
22%
May

Nov 96% → May 22% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
November 202596%24
December 202558%26
January 202681%26
February 202688%24
March 202679%14
May 202622%23
Departures on time
69%
Diverted
0%
Flights flown
150
Months covered
8

Same route, other flights

Keep nerding

Based on 154 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.